#3 Seth Rollins

The Undertaker has never squared off against Seth Rollins in singles competition despite facing two-thirds of the Shield previously. "The Architect" is a versatile performer and delivers tremendous performances on a weekly basis.
Despite being directionless in 2017, Rollins has finally found himself in a pleasant spot. Regardless of what happens tonight, "The Man" is heading for greater things in 2018.
WWE has no plans for these former AEW wrestlers? Here's why!
Therefore, if the 31-year old Superstar is looking to reclaim the main event spot, then a showdown with the Undertaker could push him to the limits.
The feud, the booking, and the matches could be terrific; elevating Rollins to another level. The Undertaker's physical condition has depreciated his in-ring value, but the "King Slayer" could carry him to a fantastic match.
How WWE has messed up John Cena's last run - Check here!